Not the best but efficient….
I buy Walmart $5 sunglasses in the fishing section and have a few pairs in each vehicle, the camper, and about 5 pair in the boat for the kids.
I have been through two vortex 4000 gbs due to battery draining issue. Hoping the 3rd one will be good to go. If not, sounds like they’ll just keep sending new ones until it’s resolved. Customer service is amazing of course. They built around 20,000 units and sounds like this is the only issue...